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Simplifying a + b + (b + 13) = 180 Reorder the terms: a + b + (13 + b) = 180 Remove parenthesis around (13 + b) a + b + 13 + b = 180 Reorder the terms: 13 + a + b + b = 180 Combine like terms: b + b = 2b 13 + a + 2b = 180 Solving 13 + a + 2b = 180 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + a + -13 + 2b = 180 + -13 Reorder the terms: 13 + -13 + a + 2b = 180 + -13 Combine like terms: 13 + -13 = 0 0 + a + 2b = 180 + -13 a + 2b = 180 + -13 Combine like terms: 180 + -13 = 167 a + 2b = 167 Add '-2b' to each side of the equation. a + 2b + -2b = 167 + -2b Combine like terms: 2b + -2b = 0 a + 0 = 167 + -2b a = 167 + -2b Simplifying a = 167 + -2b
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